1 #include <linux/bio.h> 2 #include <linux/io.h> 3 #include <linux/export.h> 4 #include <xen/page.h> 5 6 bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, 7 const struct bio_vec *vec2) 8 { 9 #if XEN_PAGE_SIZE == PAGE_SIZE 10 unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page)); 11 unsigned long bfn2 = pfn_to_bfn(page_to_pfn(vec2->bv_page)); 12 13 return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) && 14 ((bfn1 == bfn2) || ((bfn1+1) == bfn2)); 15 #else 16 /* 17 * XXX: Add support for merging bio_vec when using different page 18 * size in Xen and Linux. 19 */ 20 return 0; 21 #endif 22 } 23 EXPORT_SYMBOL(xen_biovec_phys_mergeable); 24